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- Nilsson, Sven, et al.
(författare)
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Biodiversity at Linnaeus' birthplace in the parish of Stenbrohult, southern Sweden. 5. Butterflies and burnet moths.
- 2006
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Ingår i: Entomologisk tidskrift. - 0013-886X. ; 127:1-2, s. 39-55
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Tidskriftsartikel (refereegranskat)abstract
- We counted butterflies in almost all open grasslands in an area of 8000 hectare over five years (2001-2005) in the central part of the parish of Stenbrohult, southern Sweden (Fig. 1; 56 degrees 37' N, 14 degrees 11' O). This area is currently dominated by forests. Grasslands, mainly grazed by cattle and horses, only cover about 6 % of the area. The study area consisted of 18 farms, most ot them are surrounded by coniferous forests and some bordering lakes. Three farms are protected as nature reserves and more reserves are planned for at least four more farms. Habitat types were mapped on each farm (Table 1). Standardized transects counts, with 6 - 8 annual visits evenly spread over the period from the middle of May to the middle of August, were performed in all 18 farms. The annual maximal counts of butterflies and burnet moths at one occasion in each subarea and year are presented (Appendix). The sum of these were 56 682 individuals of 46 species of butterflies and 2 791 individuals of 4 species of burnet moths. One individual each of two additional species, Limenitis populi in 2000 and Issoria lathonia in 2003, was found outside the standardized counts. Many species were recorded in low numbers in 2001 and high in 2003, some increasing by an order of magnitude. There were also a very high variation of species richness and numbers of individual species between the different farms. The highest number of species were found on farms in the central part of the study-area and on farms with traditionally managed and unfertilized hay-meadows. We discuss the possible causes of these variations. Our results show that monitoring schemes must include many plots and years to reveal population trends due to land management changes. Many species occurred in low numbers and since suitable habitats have decreased they may constitute an extinction debt, e.g. Pyrgus malvae, Leptidea sinapis, Aporia crataegi, Coenonympha pamphilus, Lasiommata maera, Polyommatus semiargus and Zygeana.filipendulae. We propose measures to prevent this debt to be realised.
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- Nilsson, Sven
(författare)
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Rödlistade och sällsynta vedskalbaggar i Strömsrum, Småland. [Red-listed and rare wood-living beetles at Strömsrum, Småland]
- 2008
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Ingår i: Entomologisk tidskrift. - 0013-886X. ; 129:3, s. 149-163
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Tidskriftsartikel (refereegranskat)abstract
- Strömsrum in SE Sweden is one of the most important areas for threatened insects in northern Europe. This is a review of the red-listed and formerly red-listed species of wood-living beetles collected at Strömsrum with notes of their habitats. In an area of a few hundred hectares over 1000 old hollow oaks and almost as many hollow trees of other deciduous trees occur. From the current red list (Gärdenfors 2005) 95 wood-living beetle species have been found in 1970-2005 and 22 species earlier. Furthermore, 49 species red-listed until recently have also been collected at Strömsrum. However, I expect that more threatened beetles will be found in the area in the future, since e.g. two “new” threatened beetles were found in 2005. Old, hollow living and dead oaks are the most important habitat features for the threatened insects, but other old living and dead deciduous trees are also very important.
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| 16. |
- Nilsson, Sven, et al.
(författare)
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The hoverflies (Diptera, Syrphidae) on a small farm at Linnaeus´ birthplace in the parish of Stenbrohult, Sweden
- 2007
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Ingår i: Entomologisk tidskrift. - 0013-886X. ; 128:4, s. 133-148
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Tidskriftsartikel (refereegranskat)abstract
- We made a detailed study of the hoverflies on a small farm in the parish of Stenbrohult, southern Sweden in 2004-2007. The study area is totally about 17 ha, consisting of 9 ha of semi-natural grasslands with both dry and wet parts (recently mainly grazed by cattle and a few horses in late summer-autumn), a few hectares of old deciduous forest dominated by Fagus, Quercus, Betula, Populus tremula, Acer platanoides and Corylus adjacent to coniferous forest, and 10 small fens that often dry out in summer. Peat-bogs, both open and with old pines, occur adjacent to the study area. In total, during the four years, 163 species of hoverflies were collected (number of individuals in Table 1), with 126 species in 2006 and 134 in 2007. Many rare species were found, including those dependent on old living trees, dead deciduous trees, meadows, wetlands with unpolluted water and various shrubs and herbs. Six species suggested by Speight (1989) as indicators of especially valuable forests for nature conservation in Europe were found: Brachyopa bicolor, Brachyopa panzeri, Chalcosyrphus piger, Chalcosyrphus valgus, Hammerschmidtia ferruginea and Xylota meigeniana. Notable is also other wood-living species, e.g. Blera fallax, Brachypalpoides lentus, Brachypalpus laphriformis, Criorhina ranunculi, Spilomyia diophthalma, Temnostoma bombylans, 7 species of Brachyopa and 7 species of Xylota. Details about phenology, tree and flower visitis are given for many less common species. Reasons for the exceptionally high local species richness is discussed.
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- Pettersson, Lars, et al.
(författare)
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Comparing wine-based and beer-based baits for moth trapping: a field experiment
- 2008
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Ingår i: Entomologisk tidskrift. - 0013-886X. ; 129:3, s. 129-134
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Tidskriftsartikel (refereegranskat)abstract
- Vid fångst av nattfjärilar använder man ofta lockbeten. De består av en trasa eller liknande som dränks in med någon lockande vätska och hängs upp i t.ex. ett träd. Under natten kan betet inspekteras många gånger och djur samlas in. Recepten för den lockande vätska varierar kraftigt mellan olika samlare men innehåller alltid jästa produkter av något slag. En stor skiljelinje går mellan beten som baseras på öl och de som baseras på vin. I denna artikel ha författarna testat om öl eller vinbaserade beten ger någon avgörande skillnad i fjärilsfångst. De kunde inte finna någon skillnad varken i antal arter eller i vilka arter som kom.
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- Ryrholm, Nils, 1956-, et al.
(författare)
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Intressanta fynd av fjällfjärilar 2004
- 2005
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Ingår i: Entomologisk Tidskrift. - 0013-886X. ; 126, s. 77-84
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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